Hello Everyone!
I'm new here so forgive me if I didn't find the answer to my questions in my brief search of the posts! I am embarking on my first isolated AC to DC SMPS power supply design. I'v built several power systems over the years but flyback systems have always kind of scared me lots of places to go wrong.
To the point then, I cant find a transformer that fits the requirements any where online or even in any of the SMPS circuits I'v harvested. However I can find a coil former for winding my own. I have taken a few of these buggers (flybacks) apart and I get the basic idea of construction, but there are some things I am not clear about.
First the coil former I have selected! The third attachment is its data sheet.
http://www.newark.com/epcos/b66208b1110t1/coil-former-e25-13-7-valox-420se0/dp/79T4675?in_merch=Popular%20Products The first attachment is a graphical representation of how the transformer should be constructed. The second attachment is an image of the reference design circuit if any one is curious.
My questions are as follows!
1. How important is the right hand rule in a flyback, will Faraday's integral law bite me in the arse if I don't observe it!
2. What kind of tape should I use, and what kind of copper foil if any! I am considering kapton is that acceptable?
3. Is there anything special I should consider about terminating the wingdings???
4. Do I need to wrap all the layers individually and connect them at the terminals? If they are all connected in series any way, can I wrap the first primary and possibly the second primary all at once instead of terminating them and layering the secondary between them.
5. The primary and AUX coils are all enamelled that makes sense.. but the secondary is labeled Triso? Can any one tell me what that means?
6. Is there anything I should know other than what I'v asked!
Thank you ahead of time for insight!